Window Well & Egress Window Excavation Cost in Toronto: 2026 Guide

Window wells solve two problems at once. They let real daylight into a Toronto basement, and they create a code-legal egress route for bedrooms below grade. Without them, an old basement bedroom in a Toronto semi or Vaughan walkout is just a finished storage room. In 2026, window well excavation alone runs $800 to $2,000 per well. A full egress window install with cutting, unit, well, and drainage is $3,500 to $8,000 per opening. Call OCM at 416-317-3090 for a site quote across Toronto and the GTA.

What Window Well Work Actually Costs in Toronto in 2026

Pricing for the most common configurations across Toronto, Vaughan, Markham, Mississauga, Oakville, and the rest of the GTA:

• Window well excavation only (existing window, new well): $800 to $2,000 per well.
• New egress window full install (cutting, window, well, drainage): $3,500 to $8,000 per opening.
• Concrete wall cut for new opening: $1,500 to $2,500 depending on wall thickness.
• Casement egress window unit: $600 to $1,200 supply.
• Galvanized window well: $150 to $400 material.
• Poured concrete window well: $600 to $1,500 material plus labour.
• Drainage tie-in to weeping tile: $400 to $1,200.
• Toronto Building permit: Confirm current fees with toronto.ca for structural alterations.
• Multiple windows on same job: Significant per-well discount because the equipment and crew are already on site.

For comparison with related work, see our basement waterproofing cost guide if foundation work is part of the same project.

Why Egress Windows Matter Under the Ontario Building Code

The Ontario Building Code requires every bedroom to have at least one egress window. For below-grade bedrooms, that means:

• Minimum opening area: 0.35 square metres (roughly 3.77 sq ft).
• No dimension less than 380 mm (15 inches).
• Sill height: maximum 1.5 metres (about 60 inches) above the basement floor.
• Window must open without keys, tools, or special knowledge.
• If the window opens into a well, the well must be at least 760 mm (30 inches) of clearance away from the foundation.

Confirm current OBC requirements at the time of your permit application because the code is updated periodically. The legal-second-suite path in Toronto specifically requires egress-compliant bedrooms. Without it, the suite cannot be registered and the rental is not legal.

What Drives the Price

Existing Window or New Opening

If you have an existing basement window that meets size requirements, you just need a deeper window well outside. Half the cost. If you need to enlarge or create a new opening in the concrete foundation, add $1,500 to $2,500 for cutting plus engineering review for the lintel.

Foundation Wall Thickness

Old Toronto homes often have 12-inch poured concrete or rubble stone foundations. Newer GTA construction is 8 to 10-inch poured. Thicker walls take more cutting time and bigger blades. Rubble foundations need extra structural support during cutting. Add $500 to $1,500 for thick or rubble walls.

Depth of Excavation

A basement window with the sill 30 inches below grade needs a 4-foot well. A window with the sill 5 feet below grade needs a 6-foot well. Each additional foot of depth adds excavation time, more soil to haul, and increased shoring complexity.

Soil Type

GTA clay digs fine. Sandy soil or fill near the foundation can collapse and need bracing. Rocky soil slows the dig. Most Toronto residential lots are standard clay, no surcharge needed.

Access

Front yard window wells are easiest. Side yard wells in old Toronto neighborhoods with 3-foot side gates require hand digging. Rear basement wells often need wheelbarrow haulage through narrow passages. Tight access adds $300 to $900 per well.

Drainage Solution

Connecting the well drainage to existing weeping tile is moderately expensive ($400 to $1,200) but reliable. Running a separate discharge line to the yard adds more pipe length. Skipping drainage is cheaper but creates a guaranteed future flood.

Our Window Well Process

1. Site visit. Measure window, evaluate access, identify drainage tie-in options.
2. Permits if required. New openings need Toronto Building permit and engineering for the lintel.
3. Ontario One Call locates. Mandatory before digging next to a foundation.
4. Excavate. Hand-dig or mini-excavator depending on access. Down to 4 to 6 inches below the bottom of the planned well.
5. Concrete cutting (if new opening). Diamond-blade saw, dust-controlled. Install lintel.
6. Window install. Set the new unit, flash and seal.
7. Well install. Set the galvanized, plastic, or poured concrete well against the foundation, anchor to wall.
8. Drainage. 12 inches of clear stone in the well bottom, perforated pipe to weeping tile or discharge.
9. Backfill and grade. Compacted backfill outside the well, surface graded away from the foundation.
10. Restore lawn. Topsoil and seed or sod.

Drainage Done Right: Why Most Window Wells Eventually Flood

Half the window wells we are called to fix in Toronto failed because the original installer skipped drainage. Here is the right way:

• 12 inches of 3/4 inch clear stone at the bottom of the well.
• Perforated pipe through the stone, connecting to the foundation weeping tile or a separate drain line.
• Well lip at least 6 inches above grade so surface water cannot wash in.
• Slope grade away from the well for 10 feet in every direction.
• Clear cover if the well is in a high-leaf-fall area to keep debris out.

If you skip the gravel and pipe, the well becomes a bucket that fills with water in a heavy rain. Then the water finds the weakest path inside, usually right at the new window. Two-year warranty on the window is meaningless when the actual problem is upstream.

When Window Wells Are Part of a Bigger Job

Window well excavation rarely happens in isolation. Common pairings we see across the GTA:

• Legal second suite conversion. Egress windows are required for every below-grade bedroom. Often paired with underpinning for ceiling height.
• Basement waterproofing. If we are already digging the foundation for waterproofing, adding window wells is incremental cost. See our waterproofing cost guide.
• New basement walkout. Egress windows pair with a walkout door for a complete below-grade exit strategy.
• Foundation crack repair. Crack repair often involves digging next to the foundation, so window wells add minor cost.

Bundling related work cuts mobilization cost. Always ask your contractor what else is worth doing while the foundation is exposed.

Permits and Toronto Building Department

Three permit scenarios:

• Just deepening an existing well: Typically no permit. Confirm with your local building department because rules vary by GTA city.
• Enlarging or creating a new window opening: Toronto Building permit required. Structural alteration. Engineered lintel and stamped drawing needed.
• Part of a second-suite registration: Egress windows are part of the larger second-suite permit package under Toronto Zoning By-law 569-2013 and the OBC.

Current permit fees vary by city and update annually. Call 311 in Toronto, or the building department in Vaughan, Markham, Richmond Hill, Mississauga, Brampton, Oakville, Aurora, Newmarket, or King City. We sort the paperwork as part of every quote.

Why Choose OCM for Window Well Work Across the GTA

We do foundation-adjacent excavation every week. Window wells are routine for us. Licensed and insured across the GTA.

• Drainage done properly the first time.
• Concrete cutting in-house, dust-controlled.
• Galvanized, plastic, or poured concrete wells, your choice.
• Coordinated with window installers, basement framers, and second-suite permit processes.
• Clean handoff to the next trade.

We service Toronto, Vaughan, Markham, Richmond Hill, Mississauga, Brampton, Oakville, Aurora, Newmarket, and King City. See our work in Toronto, Vaughan, and Mississauga.

Frequently Asked Questions

How much does window well excavation cost in Toronto?

Window well excavation alone in Toronto runs $800 to $2,000 per well in 2026. Full egress window installation including concrete cutting, window unit, well, drainage, and backfill is typically $3,500 to $8,000 per opening. Cost depends on depth, soil, access, and whether you need to enlarge the foundation opening.

What size egress window is required by Ontario code?

Ontario Building Code requires a minimum 0.35 square metres of unobstructed opening with no dimension less than 380 mm (15 inches). The window must open from the inside without tools, keys, or special knowledge. Bedrooms below grade specifically need an egress window meeting these specs. Confirm current OBC requirements with your building department.

Do I need a permit for a window well in Toronto?

Cutting or enlarging a basement window opening in a concrete foundation requires a Toronto Building permit because it is a structural alteration. A simple window well around an existing window opening does not. If you are creating a legal second suite, the egress window permit is part of the larger second-suite permit package.

How deep does a window well need to be?

Deep enough to expose the full window below grade plus 4 to 6 inches of clearance for drainage gravel. Most Toronto basement windows are 24 to 48 inches below grade. Window wells extend 6 inches above grade so surface water does not pour in. Total excavation depth is typically 3 to 5 feet.

What about drainage in a window well?

Critical. A window well without drainage fills with water and floods the basement through the window. We install 12 inches of clear gravel in the well bottom, tied into either the foundation weeping tile or a discharge line to the yard. Skip this and you will be back replacing a damaged window within 2 years.

Can I install a window well in winter?

Concrete cutting can happen year-round. Excavation in frozen GTA ground is slower and costs more. Most window wells get installed April through November. If you need an emergency egress for an existing illegal basement suite, we can work in shoulder season but expect 10% to 20% winter premium.

What materials are used for window wells?

Three options. Galvanized steel ($150 to $400 per well) is standard and lasts 15 to 20 years. Plastic or composite ($200 to $500) is lightweight and rust-proof. Poured concrete or block ($600 to $1,500) is permanent and integrates with foundation waterproofing. We recommend galvanized for most Toronto residential jobs and concrete for large egress openings.

Will window well work damage my landscaping?

Some. We need to dig a 3 to 5 foot deep hole next to the foundation. Sod and any plants in the footprint get removed. We replace topsoil and reseed at the end, but mature plantings in the work zone need to be transplanted or replaced. Plan for a 6×6 foot work area around each window.

Book a Window Well Quote

Call OCM at 416-317-3090 for an on-site quote across Toronto and the GTA. We will measure the window, look at access, identify drainage options, and quote line by line. Get a free quote here. If window wells are part of a basement conversion, also see our underpinning and basement waterproofing cost guides.